You never know if some "tech" decided it was a good idea to clean the playfield with paint thinner.

Then..... OOPS!

If you look at the blotches by the weapons targets, it looks like something was spilled on the playfield.

I put silverjets in all my games as soon as I get them. I know peopke say not to use them in games with magnets. But I have never had an issue.

Sterns pinballs are garbage from new.

Star trek seems to beat up the balls pretty bad too.
I an on my 3rd set of silverjets since NIB.

2700 plays on my ST. So probably switched out  just under every 1000 games.

My guess looking at the spots on the playfield....
Looks like oil or something was in the wood before it was silkscreened and cleared.
Thats seems the only way it would wear in spots like that. That would also make sence as the wood portion is bad and the inserts are ok.

Good if warranty is going to cover it. It should.